No sign of life - ideal ICOS 15he

[shyguy2005]

Hi guys,

Just got back from a neighbours house who’s ideal ICOS 15he showing no sign of life. Not lights nothing.

Checked fuse spur and working fine.
240v to boiler .
240v to on/off switch.
Checked short circuit on the on/switch and came back fine.

I’d say main pcb has gone but how do you test to make sure it’s not the user control board?

Now he recently swapped his programmer (Honeywell) up in the airing cupboard as screen was constantly flickering on/off even when no demand etc.
So he’s got like for like and I’m guessing just pulled the old off and clicked new one on without isolating power . Could this surge the board?

Cheers. .

 

[Gas74]

Usually main Pcb if blank. In fact always is if power

 

[Harvest Fields]

I’ll second that. Only had the user go on very rare occasions.

 

[king of pipes]

Agreed guys 2 boards on them so be careful . Kop

 

[quality]

Display board can fail but 90 % of the time it the main PCB.